I suppose it could be large areolas, but it’s probably pasties. From the looks of it, it could be both.

Uncle Scoopy's world-weary musings about naked celebrities, sports, humor and other important, manly things.
… as the good lord intended. Film clip here. Samples: Share via: Facebook X (Twitter) LinkedIn More
E-Rat is lookin’ good in a flimsy tee. Share via: Facebook X (Twitter) LinkedIn More
An American production now showing at Cannes. I have only seen the trailer. Desperate to become a father, a man spends a weekend falling for a woman who believes God has warned her never to have children. Video (from the trailer) Original source Share via: Facebook X (Twitter) LinkedIn More
Yes they could be those see-through pasties referred to in another thread in this forum earlier this week. The purpose of such pasties remains a mystery.
Their purpose is usually to shield the nipples from rough/irritating fabrics, rather than for modesty.
Yes, I guess that is it. It is kind of nice that a woman would want to preserve that see-through effect and go to the trouble of enduring that happens.
Down to the depths with whoever invented pasties.